I'll air up the cylinders today to make sure all the valves are actually closed and tomorrow I'll get a new borescope.
No evidence of mice anywhere.
Puzzling for sure, appreciate all the responses. I guess if I find nothing in the holes I'll start tearing down.
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1967 GTO 416 5-spd streetcar 11's on HP low 10's 150 shot
1965 GTO 10-71 Littlefield high-helix retro/Bird (untuned) 8.44 @164 3500+lbs 10.5W's SOLD!
1964 421 GP-Sold
6.0 cert. Fiat bodied altered blown alcohol Pontiac IAII-Sold
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